- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/optimizes_into_variable.rs:+0:11: +0:11
      let _1: i32;                         // in scope 0 at $DIR/optimizes_into_variable.rs:+1:9: +1:10
      let mut _2: (i32, bool);             // in scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
      let mut _4: [i32; 6];                // in scope 0 at $DIR/optimizes_into_variable.rs:+2:13: +2:31
      let _5: usize;                       // in scope 0 at $DIR/optimizes_into_variable.rs:+2:32: +2:33
      let mut _6: usize;                   // in scope 0 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
      let mut _7: bool;                    // in scope 0 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
      let mut _9: u32;                     // in scope 0 at $DIR/optimizes_into_variable.rs:+3:13: +3:36
      scope 1 {
          debug x => _1;                   // in scope 1 at $DIR/optimizes_into_variable.rs:+1:9: +1:10
          let _3: i32;                     // in scope 1 at $DIR/optimizes_into_variable.rs:+2:9: +2:10
          scope 2 {
              debug y => _3;               // in scope 2 at $DIR/optimizes_into_variable.rs:+2:9: +2:10
              let _8: u32;                 // in scope 2 at $DIR/optimizes_into_variable.rs:+3:9: +3:10
              scope 3 {
                  debug z => _8;           // in scope 3 at $DIR/optimizes_into_variable.rs:+3:9: +3:10
              }
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/optimizes_into_variable.rs:+1:9: +1:10
-         _2 = CheckedAdd(const 2_i32, const 2_i32); // scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
-         assert(!move (_2.1: bool), "attempt to compute `{} + {}`, which would overflow", const 2_i32, const 2_i32) -> bb1; // scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
+         _2 = const (4_i32, false);       // scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
+         assert(!const false, "attempt to compute `{} + {}`, which would overflow", const 2_i32, const 2_i32) -> bb1; // scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
      }
  
      bb1: {
-         _1 = move (_2.0: i32);           // scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
+         _1 = const 4_i32;                // scope 0 at $DIR/optimizes_into_variable.rs:+1:13: +1:18
          StorageLive(_3);                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:9: +2:10
          StorageLive(_4);                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:31
          _4 = [const 0_i32, const 1_i32, const 2_i32, const 3_i32, const 4_i32, const 5_i32]; // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:31
          StorageLive(_5);                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:32: +2:33
          _5 = const 3_usize;              // scope 1 at $DIR/optimizes_into_variable.rs:+2:32: +2:33
          _6 = const 6_usize;              // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
-         _7 = Lt(_5, _6);                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
-         assert(move _7, "index out of bounds: the length is {} but the index is {}", move _6, _5) -> bb2; // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
+         _7 = const true;                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
+         assert(const true, "index out of bounds: the length is {} but the index is {}", const 6_usize, const 3_usize) -> bb2; // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
      }
  
      bb2: {
-         _3 = _4[_5];                     // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
+         _3 = const 3_i32;                // scope 1 at $DIR/optimizes_into_variable.rs:+2:13: +2:34
          StorageDead(_5);                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:34: +2:35
          StorageDead(_4);                 // scope 1 at $DIR/optimizes_into_variable.rs:+2:34: +2:35
          StorageLive(_8);                 // scope 2 at $DIR/optimizes_into_variable.rs:+3:9: +3:10
          StorageLive(_9);                 // scope 2 at $DIR/optimizes_into_variable.rs:+3:13: +3:36
          Deinit(_9);                      // scope 2 at $DIR/optimizes_into_variable.rs:+3:13: +3:36
          _9 = const 42_u32;               // scope 2 at $DIR/optimizes_into_variable.rs:+3:13: +3:36
-         _8 = _9;                         // scope 2 at $DIR/optimizes_into_variable.rs:+3:13: +3:38
+         _8 = const 42_u32;               // scope 2 at $DIR/optimizes_into_variable.rs:+3:13: +3:38
          StorageDead(_9);                 // scope 2 at $DIR/optimizes_into_variable.rs:+3:38: +3:39
          StorageDead(_8);                 // scope 2 at $DIR/optimizes_into_variable.rs:+4:1: +4:2
          StorageDead(_3);                 // scope 1 at $DIR/optimizes_into_variable.rs:+4:1: +4:2
          StorageDead(_1);                 // scope 0 at $DIR/optimizes_into_variable.rs:+4:1: +4:2
          return;                          // scope 0 at $DIR/optimizes_into_variable.rs:+4:2: +4:2
      }
  }